W. North America;
(1) Coastal sc. Alaska. W. Canada (interior British Columbia and s. Mackenzie (Great Slave Lake), e. Alberta, Saskatchewan and sw. Manitoba) s. to nc. United States (South Dakota).
(2) Nw. United States in w. Washington s. to c. California and in the Great Basin of w. Nevada, n. Utah, nc. Colorado and c. Montana, Wyoming, ec. North Dakota and ne. South Dakota.
Winters along the Pacific coast from British Columbia and w. United States to sw. Mexico.